Carrier Access Adit 3200, Reference Manual

Page: 249 / 262

Adit 3000 (Rel. 1.6) and MSR Card (Rel 2.0) GUI Glossary-5
Glossary
10Base-T The most widely installed Ethernet local area networks (LANs) use ordinary telephone
twisted-pair wire. When used on Ethernet, this carrier medium is known at 10BASE-T.
10BASE-T supports Ethernet’s 10 Mbps transmission speed.
100Base-TX Also called “Fast Ethernet”, it is a 100 Mbps version of Ethernet. 100Base-T transmits at
100 Mbps rather than 10 Mbps. Like regular Ethernet, Fast Ethernet is a shared media LAN.
All nodes share the 100 Mbps bandwidth. 100Base-TX uses two pairs of Category 5
cabling, one pair for transmission, one pair for receiving.
Address Resolution
Protocol (ARP) An internet protocol used to map dynamic internet addresses to physical addresses on Local
Area Networks.
Alternate Mark
Inversion (AMI) The line-coding format in T1 transmission systems whereby successive ones (marks) are
alternately inverted (sent by polarity opposite that of the preceding mark).
analog The telephone transmission of voice, video or image. Telephone transmission and/or
switching that is not digital.
Asynchronous Transfer
Mode (ATM) Very high speed transmission technology. ATM is a high bandwidth, low-delay,
connection-oriented, packet-like switching and multiplexijng technique. Usable capacity is
segmented into 53-byte fixed-size cells, consisting of header and information fields,
allocated to services on demand. The term “asynchronous” applies, as each cell is presented
to the network on a “start-stop” basis - in other words, asynchronously.
authentication The process of identifying an individual, usually based on a username and password
combination, although the process can be many more steps. In security systems,
authentication is distinct from authorization, which is the process of giving individuals
access to system objects based on their identity. Authentication merely ensures that the
individual is who he or she claims to be, but says nothing about the access rights of the
individual. Authentication in whatever form, is usually followed by authorization.
bandwidth The width of a communications channel. Analog is typically measured in Hertz (cycles per
second), a voice conversation is typically measured in bits per second.
Basic Rate Interface
(BRI) Basic Rate Interface (2b+d) in ISDN.
Bipolar 8-Zero
Substitution A coding scheme that maintains ones density.
bipolar violation BPV. A violation is declared for AMI if two successive pulses have the same polarity.
bit Contraction of the words "binary" and "digit".
Bit Error Rate The number of erred bits divided by the total number of bits.
broadband A technology that provides an extremely wide and fast bandwidth so that many people can
simultaneously use the service. It is generally associated with multiple types of
transmissions on the same connection such as voice, data, video and digital or analog
information.